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Bug#76478: Grub will not believe that my bios can read beyond 512Mb.


From: Jochen Hoenicke
Subject: Bug#76478: Grub will not believe that my bios can read beyond 512Mb.
Date: Fri, 10 Nov 2000 15:50:43 +0100 (MET)

On Nov 10, Sven LUTHER wrote:
> Ok, here is more data, ...
> 
> First, i was using grub 0.5.95, downloaded the newer version today (0.5.96.1)
> will see if it changes anything.
> 
> The exact message is :
> 
> Error: Selected cylinder exceeds maximum supported by bios.
> 
> some more info is as follows :
> 
> when in the grub boot menu, before launching linux, i do a geometry (hd0) :
> 
> driver 0x80 : C/H/S = 1024/16/63, sectors = 1032192, LBA
>                       ^^^^^^^^^^
>                     Wrong, ...

As long as GRUB is using LBA, the C/H/S information is completely
ignored.  C is always 1024 or less, except in grub shell, and this is
a limitation of the old bios interface.

What is wrong is the total number of sectors.  Your bios doesn't
provide it, so grub has to calculate it from C/H/S.

In grub-0.5.96.1 the total number of sectors is also ignored, so it
should work.

  Jochen




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